Abstract

Just as in the husbandry of land animals or in the production
of agricultural crops, disease occurs in the culture of fishes and
shellfishes. The problem of diseases has assumed considerable
significance with the rapid developments that are now occurring
in the culture of aquatic species. New diseases are occurring in
intensive culture systems, whether they are under experimental
conditions or in grow out systems, and unless we have a sufficient
knowledge of the nature of these diseases and their control, aquaculture
practices can hardly become successful. An attempt is
made here to define disease and pathogen, and different categories
of diseases.